CURRICULUM

Atomic Structure: Four Difficulties, 4000 Levels

Atomic Structure has four difficulties with 1000 levels each and ten questions per level; stabilize accuracy before moving up. Atomic structure levels count protons, neutrons and electrons; charge changes electrons, not protons.

原子结构基础闯关Atomic Structure Basics1000 关原子结构进阶闯关Atomic Structure Intermediate1000 关原子结构高阶闯关Atomic Structure Advanced1000 关原子结构挑战闯关Atomic Structure Challenge1000 关

How it works

  1. Start at the basic difficulty.
  2. Ten questions per level; clear one to unlock the next.
  3. Review at 1/3/7/14/30 days.

FAQ

Which difficulty?

Start at basic and move up when accuracy stays above 80%.

How many levels each?

1000.